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java.lang.NullPointerException: 	at org.apache.log4j.helpers.PatternConverter.spacePad(PatternConverter.java:107)	at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:80)	at org.apache.log4j.PatternLayout.format(PatternLayout.java:506)	at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:310)	at org.apache.log4j.WriterAppender.append(WriterAppender.java:162)	at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)	at rg.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)	at org.apache.log4j.Category.callAppenders(Category.java:206)	at org.apache.log4j.Category.forcedLog(Category.java:391)	at org.apache.log4j.Category.log(Category.java:856)	at org.slf4j.impl.Log4jLoggerAdapter.info(Log4jLoggerAdapter.java:305)	at org.quartz.plugins.management.ShutdownHookPlugin$1.run(ShutdownHookPlugin.java:125)